I quit achaea before riding went in, so I've never seen the skillset before. So, I have a lot of questions about it.

For one, does the trample move require you to be mounted on the creature? I don't think a geomancer should use a mount, it's like saying you're too good to walk the earth. But I would love having access to the trample move.

Also, does it decrease damage/accuracy from physical attacks here like it does in achaea?

And overall, do you all think it's a good skillset to learn?

Despite the bad blood between us, I'll give you good advice:

No no no no no no no.

Do not learn riding.

I had great success with trample as an Aquamancer.

Ceres whips a proud celestial pegasus into a fury, bucking and racing
dangerously in a circle, trampling the ground in a frenzy.
Ceres slings a gyfu rune and a cen rune at you, hitting you in the chest.
Ceres whips a proud celestial pegasus into a fury, bucking and racing
dangerously in a circle, trampling the ground in a frenzy.
3897h, 3075m, 4057e, 6p, 16570en, 15390w kdb- equilibrium|balance-Free!
Ceres whips a proud celestial pegasus into a fury, bucking and racing
dangerously in a circle, trampling the ground in a frenzy.
4064h, 3077m, 4057e, 4p, 16570en, 15423w ekdb- equilibrium|balance-Free!
The ghostly outline of a gyfu rune briefly appears in front of you before
slamming into your forehead.
3891h, 3117m, 4057e, 5p, 16570en, 15437w exkdbp- equilibrium|balance-Free!
Ceres whips a proud celestial pegasus into a fury, bucking and racing
dangerously in a circle, trampling the ground in a frenzy.
3967h, 2837m, 4057e, 6p, 16570en, 15341w xkdb- equilibrium|balance-Free!
The ghostly outline of a gyfu rune briefly appears in front of you before
slamming into your forehead.
3779h, 2838m, 4057e, 7p, 16570en, 15359w xkdbp- equilibrium|balance-Free!
Ceres whips a proud celestial pegasus into a fury, bucking and racing
dangerously in a circle, trampling the ground in a frenzy.
3848h, 2464m, 4057e, 7p, 16570en, 15209w exkdb-
Ceres points a pearl and sapphire tiara at you, and sparks fly out of it.
Sticky strands of webbing spray out to cover you.
3838h, 2866m, 4057e, 7p, 16570en, 15227w xkdbp- equilibrium|balance-Free!
The ghostly outline of a gyfu rune briefly appears in front of you before
slamming into your forehead.
3263h, 2866m, 4057e, 8p, 16570en, 15227w xkdbp- equilibrium|balance-Restrained!
You are too stunned to be able to do anything.
You have writhed free of your entanglement.
*** YOU ARE FREE OF ONE ENTANGLEMENT!!! ***
3344h, 2942m, 4057e, 8p, 16570en, 15251w exkdbp-
You are no longer stunned.
***YOU ARE NO LONGER STUNNED!***
3344h, 2942m, 4057e, 8p, 16570en, 15251w exkdbp-equilibrium|balance-Restrained!
Ceres whips a proud celestial pegasus into a fury, bucking and racing
dangerously in a circle, trampling the ground in a frenzy.
A proud celestial pegasus breaks your left leg.
Geb apply mending.A proud celestial pegasus crushes your right leg.
A proud celestial pegasus pulverizes your left arm.
A proud celestial pegasus smashes your right arm.
A proud celestial pegasus spreads its broad wings and soars out to the east.

An enormous waves sweeps over Imadis, knocking him to the ground.
Imadis coughs and splutters as he inhales some water.
An enormous waves sweeps over Kaervas, knocking him to the ground.
Kaervas coughs and splutters as he inhales some water.
You have slain Kaervas.
2544h, 3756m, 3270e, 10p exdb-
You point your staff at Drago and steam blasts out from the end, cooking his
flesh.
2544h, 3681m, 3270e, 10p xdb-
Drago crackles with blue energy that wreathes itself about his limbs.
2544h, 3681m, 3270e, 10p xdb-
The frigid waters make Kaervas's skin turn blue and his teeth begin to chatter.
The frigid waters make Drago's skin turn even bluer.
A cloud of jellyfish swarm around Drago, attacking him with tiny stings.
A cloud of jellyfish swarm around Imadis, attacking him with tiny stings.
2544h, 3681m, 3270e, 10p xdb-
---- EQUILIBRIUM ----
2544h, 3681m, 3270e, 10p exdb-
Drago takes a drink from a turquoise vial.
2544h, 3681m, 3270e, 10p exdb-
You point your staff at Drago and steam blasts out from the end, cooking his
flesh.
The stink of Drago's boiled flesh reaches you, just as he dies in terrible
agony.
You have slain Drago.
2544h, 3606m, 3270e, 10p xdb-
Imadis takes a drink from an amethyst vial.
2544h, 3606m, 3270e, 10p xdb-
Imadis takes a drink from an amethyst vial.
2544h, 3606m, 3270e, 10p xdb-
---- EQUILIBRIUM ----
2544h, 3606m, 3270e, 10p exdb-
You point your staff at Imadis and steam blasts out from the end, cooking his
flesh.
The stink of Imadis's boiled flesh reaches you, just as he dies in terrible
agony.
You have slain Imadis.

I've actually been thinking about transing riding for Trample because prone is so insanely easy for Aquamancers to get people in.

I've got other stuff I want to learn first, though.